There is no way to do this currently, maybe when the new version of Safari drops with Big Sur. Safari/MacOS does not include VP9 codec support. Chrome does it in software which is why it consumes so much power; the processors/GPUs apple use have had hardware decode support for 3-4 years, but they do not expose the capability to the OS.
However given they're making a thing about the ATV4k and the Mac supporting 4k Netflix in Big Sur, maybe there's hope that they are including support for modern codecs other than h.265 in upcoming software releases. The hardware can do it.